Motion Vectors in VR with HDRP

Hey,

somehow I don’t seem to get Motion Vectors to work correcly in VR, using HDRP (10.6 on 2020.3.14 LTS) . All post effects relying on Motion Vectors seem to be rendered incorrectly (TAA, SSAO if I use Temporal Accumulation).
I saw this unanswered question on Unity Answers: https://answers.unity.com/questions/1747062/unity-hdrp-vr-only-getting-motion-vectors-from-hea.html

Is there anything special to do to make it work correctly?

Thanks for help!

Any help or insights are very welcome…
Is this even an HDRP issue, or general Unity issue? If I am here in the wrong sub, where should I post for help?